LE CENTER, Minn. (CBS SF/AP) — At least two Piedmont residents were among the victims killed in a deadly weekend two-vehicle collision in south central Minnesota.

According to sheriff’s officials, seven people from California were in a Ford Expedition that collided with a pickup truck in Le Sueur County at an intersection in Sharon Township about 11:30 p.m. Sunday.

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Le Sueur County Sheriff Brett Mason says four people in the Expedition were killed and three passengers in the SUV were injured, as was the driver of the pickup.

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The SUV driver, 54-year-old John St. John, of Piedmont, 56-year-old Jill St. John, a 13-year-old girl and a 9-year-old boy died in the crash, sheriff’s officials said.

A 41-year-old female passenger and two boys, ages 15 and 9, were injured and taken to hospitals. The 41-year-old pickup driver, the only one in his vehicle, was taken to a Mankato hospital.

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The sheriff’s office and Minnesota State Patrol are investigating the cause of the crash, which happened about 60 miles southwest of Minneapolis-St. Paul.